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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e55247d5c3b6a1e70e295c43094f57fc6a5f84bb07cdeed7f3e449f5c8b752' 
  AND token = '4zyZIImPtXQJt2R6t2XxpYV5tbGYM7QRCW0SIIduKGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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