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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ea0808d06da28ba02c0da8c64dad5ba94de8afc8afbf5b835ca3c5bf9ced45' 
  AND token = 'a74Qjm7i2YMs2Pc3re8quPmG8bpp8nb+jIhIF37Dz6Q=' 
  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"
    }
  }
}