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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4747014e6fe64026371ed7bc5aab69cd589b03d12e27e2410d83cd3adc07c7a9' 
  AND token = 'YB/MEfCNx5XXizzTNg4py12KJ82LIemSGcfZhD2aPVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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