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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bdb2709a00297d9de31ee80260957da906cc2884dc10568d66b7f2e21b04e4d' 
  AND token = 'zHey4KuUct16tn7zEPPgoto72K7ACzB4k2tZQWkFn1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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