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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d392ea72dd7bcd8046683f4107b1ff48c6e3ec2d828d9c69aaa7db2a5840086' 
  AND token = 'KrgwwRF+N6KNF6+fX4+E1p+ndrt0sNnnrcb4otuyzDQ=' 
  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"
    }
  }
}