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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f07098db8a42ada1b17636a35fe56019278c57afa69d7d0f40befa2f1c7328' 
  AND token = 'PEPi5gftiX6+3frYPBJWgjO2SFWMeN+XJC4dwutsoAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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