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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '150cb2ca814110c639464e7addd40f3d5e04bc7dad5d3190b507b92607198610' 
  AND token = 'EBA1VdAjenoRgC5RFjU/257fRRRhkgXrx3L+wuGl7A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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