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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42fbbeb5cc41076a5ed05777009fdbef07471f339f0f22f08ff46d83539132b9' 
  AND token = '882k9EQMYqa1LlD+4iHsL2qM5ST2k83kyMBzT9ATCqY=' 
  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"
    }
  }
}