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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e70a9806fd69c055e19b4a66e11efe7b38fb62c4e13d09171cc572b6cc53b76' 
  AND token = '11EAVuKOwbmUkCMBUEhG08m0IwqqCxADWWE5XGRAchY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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