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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0cf893878ebf46765a831a997d5dd3e18e40f318a5920dcbe243e907239569d' 
  AND token = '6g5DFMlx2RAHaTsstf08hI4lrhYiUB+Kd5NDbVqLvKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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