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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '154c4bf311bb5fa24a1dbab4c5f6dead71629013d8b3e5ccd2cd313f81825896' 
  AND token = 'Fyhqf22iNgoSZ38EaWr1l2yfxGrn2hOCE/wg2gRDV5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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