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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fa25561c793d78112082c7f22a8cca94c18cfa3a05681c7ce8e9bc85d10917' 
  AND token = 'uqYEuhevXmq1A4loDAHwR37WlHesuFc2apTXMpGn8nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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