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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e990954028605bb29765ce194a6e8a56e3e27ac4b8921d514c9e3239a7cead' 
  AND token = 'jT/DYPMysd09WeXuhWDa4bHqa8w/FWQj2FLhx6xy0gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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