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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f634d351e2153715b3bfa584072add9bdd384cdd303ff1658a54ef74fcd098bd' 
  AND token = 'c2CNXL1by5U02ME/L2hZUN4ZDWs3gq+sIGIJ8yHUWFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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