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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c5f384ff5c67b53350d8eb45915b66065470f111fa1f4ae4adc2e19b9e6d62' 
  AND token = 'O0UwR4zmQiqMa7JOC+g/DsOeiIV+SaQtT211nRR48LY=' 
  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"
    }
  }
}