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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc508dd682bcda0ea8f462508764e3dc272ce01334b48260d039c8df40395c97' 
  AND token = 'lmzd9qkqx+K6QNbXSuWEBIlj2Pu1GXJJdwzC1WfHEeo=' 
  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"
    }
  }
}