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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff3c74a0a6aa643bc942befa707a14f3d2fd2dcaf41c3bd526b32623e6c7118' 
  AND token = 'Ga+1Ay860KdVivVL/JmQCJAFEri7OTVLND4LoyBoZMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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