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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5406995232728a421b5ccf38405ca79bda3159415b8e3c946f922077a9d8526' 
  AND token = 'bWqlzKT7m9G+v7h+YA5Nf+AfeNcbp3prCdgBOl6kT20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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