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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f1b9526b31826f86318f4c7e9dca666774eaefafcb90ab2b06445b18ce32d8' 
  AND token = '5d5e5owDPf0wVSV1/Zm3vRp4Nd1XKNrGidl8/8g/oTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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