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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ddc55a0ac81c932f66dd897e7301e92169e89d0f1fabeb4e4f4058e05f163a' 
  AND token = '2ltyFljc8+Ojjyo4wh/C+/7vER8w8qT7vuGeIU+6FDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}