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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd1a1cc87a4c2bec3a87345462ed9631f82c88367e92205fcb50a341f1e1733' 
  AND token = '1/+SzPDqtb1Xs9FG4eMFJiWeW+Sk0vyCf9xHHO7b+UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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