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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9e2865d94217b78bc5699376c744ade0f5109f20b3aa63a0f0ef2500285617' 
  AND token = 'dMdpLwGZTX/t5coEOnhETXhVmEnehWqaU8ESvFMgD2k=' 
  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"
    }
  }
}