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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34bb03f65caad93487ecc62d8d64f3d92663dfbb0a5ca5cec9b03eb785d4b8da' 
  AND token = '7HBord2dnNRZDsTOweVE4taWwc6I5+/p+B8Xc4dn2io=' 
  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"
    }
  }
}