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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0940c29ab3671a2c97131fd71ca0808cd9f390ecf5494e811c6ebb4d60f33fc7' 
  AND token = 'a5c1bIoAiycXcCVsmuenDjGY95njKRhqwagv20j5Hek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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