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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096504251f3ff4c773226d22044a6f49df0d94f71d09974fe9fd31732cb0b84d' 
  AND token = '726D2WzdAp7PYp5PcPtZw7y7KS2ZiEZN3QBBtFQ6oe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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