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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a286daf3e00daa77da8556a74e41c9acab44bfd4ae0a4c4d9a5d8a761b84c43' 
  AND token = 'jHETBfkFh45BHxOE56snygHSv9GA8oML9LuIxkm3kew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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