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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71cbc3825b018c4a8611d8c9ff73f7cead20b176a1354fa92fac6efcb8bce2f' 
  AND token = 'mSIPwxFB1WXBxKeYgJJcj2W4yD3TEuz8KSn7CF6vdH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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