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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac6d3f2e49c52b24491a18428b7f4aaeb16fe2dfe64ebb7c367c2fbc4286d0b3' 
  AND token = '8hqXA3OblseTHIcURFyxMo+Zl18TBORCZTCUDT7bh5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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