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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79536decdf1b6114f9483d74e111a8f0cb54d26e7f29c917daf2ce44e2a5fe16' 
  AND token = 'PL37vMCFuOPWeMtB1wN8QAgrxfyTyDGsSf0gB8EmBzA=' 
  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"
    }
  }
}