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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c936e55e730581bd1c155b63d18c968626f80462e436137c7e07f33bf9bcb57' 
  AND token = 'N+z+3Ki3sZaM7OBKzmJLlMUxSGXq6+9uNt8KUrtOr74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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