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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1ff2b8425ec244acfba3b595f2105b6388ca1e7f7c0e3e2eb0d9df33f2ac57' 
  AND token = 'AYWoSc3UJXuIaxsobpEzplcQbPt453vq65gv7Dmuw0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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