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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09cd1128fc508cf98254e59c3fa1b2fe5b7104394c6b67047bb51dd521b4d300' 
  AND token = 'ps/QuwJVNwA2QPwoKW3lRm0j80EbqiPxK3j+sCm3Oos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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