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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3461347a0d18f421a61e570fbf7f9dc7fd738a19d8e1ffa422c89a4088f86af' 
  AND token = '/BQUUb5A0dUzihnkKCS3j6JOWQcv6p7c2PYbf7ciu6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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