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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '511603bfcc0cdfca83b88d75e656d2a2dfa06ecc694e1b0796c080e8cc7808b1' 
  AND token = 'eYoP/Vqpvd0BnLJNv9d3xhtoIt7JfehtgdqRbjyN7fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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