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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b63c9e31c1d3e2d50c9e52142e3d20d39abefe6e3ea8ef1c5526fb15b526b3' 
  AND token = 'LiUNtiECH/d6tunSSBux8zD56Qdv/7azlLZ3fOCkhxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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