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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f73afed941aa3cb9898f1c76be93d4e32bde6fd60db16c95567d02b28a31fb0' 
  AND token = 'Cxrcx6UNiGT6oHEZIsS0C9JZG7QVRJP9/xn5QidTJko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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