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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f463398a3ba7bf2864c1c588daac4e33f6c38164596d370e1e44e8f46fa2e4' 
  AND token = 'kgcnsfGshzh+Lie2UvWUM8WeNX406hHpIPCQnS17j3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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