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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f6bfae3c240ab895e7b1138ccb310c1975a373c0440a82ddf63d206f3cda43' 
  AND token = 'b/4ZkDTeVqUWSEUapx3z69tYay4szrktrwuEG9/ab/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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