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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c9bbd8612d499bf56897f4d6f9105096934d88fbe2b47895c20c5c7d355f77' 
  AND token = 'qbVoLN/6Q3JYglIvgtFIl1SaS8uI3gmAWf4isv38cIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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