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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c53a41928796f5dd1ab0bffc7eb0bbce98a202fa66cdbf799587cd00c77d40' 
  AND token = 'SAzOBIU73sTGC/K2GOJ4OWGW9E+23hSsZEMp1az5aOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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