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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbfa009f14f89cc0b7ec3dd3ea0e4e8dad8bbbffc97c1cc4218c3bed2da011ac' 
  AND token = 'SX514U8yJNXIM1gLK9Bwxa7Pj6HCWhUPhmChfYO+A0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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