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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07635c43595f2608238936abbf78dd201afc884ceb3a1b4caebf81479dc2b9d5' 
  AND token = 'U34/07R1/mSkaV+Qw5O2va9Zh7rcgW+lt9y7pkcW/cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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