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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40847a1ffed6ccc8e5f485c2cad54b66b10815f4ff694333092bb0b97c97f0a3' 
  AND token = '+fJNksLpzAXfWxk3BGSx9Hr+5ufO+8kwn+8JqjHHue8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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