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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3062b802339d090f205746c35dad584dfee5eb5d36f78772d5d29905d0b559c' 
  AND token = 'axWjadUfe7xOLKi+rAVyqNo/YpUqv/dmke+ll7nyjLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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